A103013 - OEIS

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A103013

Numbers n such that 5*10^n + 4*R_n - 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

2, 3, 86, 134, 185, 344, 396, 476, 834, 1799, 2147, 2418, 5216, 5882, 6216, 13394, 19746 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (49*10^n-31)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 544...441.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(49*10^n - 31)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A042549 A153228 A041401 * A042901 A002983 A118167` `Adjacent sequences: A103010 A103011 A103012 * A103014 A103015 A103016`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(16)-a(17) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 17 23:08 EST 2012. Contains 206085 sequences.